Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
va thanh » gia thanh, ban thanh, va tinh
ban hanh » ban hang
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, te sach, tu cach
cac xuc » cam xuc, cac nuoc, chat xuc
dong xa » dong xay, duong xa, dong ha
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) tu dong xa hoi. hieu vien cac xuc ((va thanh) or (ban hanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) tu dong xa hoi. hieu vien cac xuc ((va thanh) OR (ban hanh)) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) tu dong xa hoi. hieu vien cac xuc ((va thanh) or (ban hanh)) vai cua tre*.